Benign intracortical mass, superimposed on a background of cortical dysplasia.Typical appearance: small, wedge-shaped "bubbly" mass which is based in a single gyrus, extends towards the ventricle. Characteristic features are a lack of mass effect, surrounding edema, or post-contrast enhancement. There should be little/no growth of the lesion over time.Frequently scallops inner table of skull, sometimes calcifies, and infrequently hemorrhages. Associated cortical dysplasia is common.Usually found in children/adolescents, comprises 1-2% of primary brain tumors (age <20). Patients commonly present with partial seizures. Most commonly location is in temporal lobe, followed by parietal cortex, caudate nucleus, septum pellucidum. From 5-80% of epilepsy brain specimens show DNETs.